Qt example之随机joke_example 随机-优快云博客

本文链接：https://blog.youkuaiyun.com/teamossp/article/details/8912766

本文介绍了一个使用Qt开发的笑话应用程序，该程序通过读取XML文件加载笑话内容，并使用Qt的各种组件实现了美观的用户界面。

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一、收获

二、代码

jokelabel.h

#include<QLabel>
#include<QToolButton>
class JokeLabel : public QLabel
{
    Q_OBJECT  
public:
    JokeLabel(QWidget *parent = 0);
    ~JokeLabel();
    QString jokeLoader(int n);
    QString joke;
};

jokelabel.cpp

#include "jokeLabel.h"
#include<QFile>
#include<QXmlStreamReader>
#include<QTextCodec>
#include<QTextStream>
JokeLabel::JokeLabel(QWidget *parent)
    : QLabel(parent)
{
    joke=("null"); 
}
QString JokeLabel::jokeLoader (int n)
{
    /*通过QFile打开birhtday.xml,QTextStream读取birthday.xml 通过QTextStream设置编码显示中文，然后通过QXmlStreamReader处理xml文件*/
    QFile xmlFile(":/birthday.xml");     
    if (!xmlFile.exists() || (xmlFile.error() != QFile::NoError)) {
        return QString("null");
    }
    xmlFile.open(QIODevice::ReadOnly);
    QTextStream textReader(&xmlFile);
    QTextCodec *codec=QTextCodec::codecForName("UTF-8");
    textReader.setCodec(codec);//转换显示中文
    QString content = textReader.readAll();
    xmlFile.close ();
    QXmlStreamReader reader(content);
    while (!reader.atEnd()) {
        reader.readNext();
        if (reader.isStartElement()&&
            reader.name ()=="joke"&&
            reader.attributes().value ("id").toString ().toInt()==n) {//获取随机数对应的joke
            joke= reader.attributes().value("content").toString ();
            break;
         }
    }
   return joke;    
}
JokeLabel::~JokeLabel()
{

}

MainWindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include<QPushButton>

#include<QDialog>

#include "jokeLabel.h"

#include<QWidget>

class JokeLabel;

class MainWindow : public QDialog

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    void createPushButton();

    void Layout();

signals:

public slots:

    void showLabel();

private:

 JokeLabel *label;

 QPushButton *quitButton;

 QPushButton *refreshButton;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"

#include<QHBoxLayout>

#include<QDebug>

MainWindow::MainWindow(QWidget *parent) :

    QDialog(parent)

    /*设置MainWindow的风格：背景图片及其位置*/

    setStyleSheet(QString::fromUtf8("background-image: url(:/background);\

                                    background-position:center;"));

    label=new JokeLabel;

    /*设置label的风格，颜色：黑，无边界，字体大小*/

    /*关于stylesheet可以参考qt文档的Qt StyleSheet Reference*/

    label->setStyleSheet (tr("color:black;border:none;font:bold normal;\

                             font-size: 18px"));

    createPushButton ();

    Layout();

    connect(refreshButton,SIGNAL(released()),this,SLOT(showLabel()));

    connect(quitButton,SIGNAL(released()),this,SLOT(close()));

void MainWindow::showLabel()

    refreshButton->clearFocus ();

    int n=std::rand()%67;//产生随机数

    label->setText(label->jokeLoader (n));

    label->setGeometry(QRect(0, 0, 480, 800));

    label->setWordWrap(true);//text包裹在label中，实现自动换行

    label->setAlignment(Qt::AlignTop);//文字对齐

    label->show ();

void MainWindow::Layout ()

    QGridLayout *main1Layout=new QGridLayout;

    main1Layout->addWidget (quitButton,31,25,5,5);

    main1Layout->addWidget (refreshButton,31,0,5,5);

    main1Layout->addWidget (label,0,0,30,30);

    setLayout(main1Layout);

MainWindow::~MainWindow ()

    delete label;

    delete quitButton;

    delete refreshButton;

void MainWindow::createPushButton ()

    quitButton =new QPushButton(tr("退 出"),this);

    quitButton->setStyleSheet

            (QString::fromUtf8\

            ("background-image: url(:/toolbutton);\

            background-position:center;\

            border:none;color:white;\

            font:  normal;\

            font-size: 20px"));

    quitButton->setFixedSize (65,44);

    quitButton->clearFocus ();

    refreshButton =new QPushButton(this);

    refreshButton->setStyleSheet

            (QString::fromUtf8\

            ("background-image: url(:/toolbutton);\

             background-position: center;\

             border:none;color:white;\

             font: normal ;\

             font-size: 20px;"));

    refreshButton->setText (tr("刷 新"));

    refreshButton->setFixedSize (65,44);

main.cpp

#include "mainwindow.h"

#include <QApplication>

#include<QTextCodec>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));

    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));

    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));//按钮显示中文不乱码

    MainWindow w;

    w.show();

    return a.exec();